Lens Unit Adsorption Head for High-Precision Imaging Module Alignment
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Solution Overview
Problem
Existing imaging module manufacturing methods face challenges in accurately determining the position of the lens unit during the positioning of the imaging element unit and lens unit, leading to potential deviations in the optical axis direction, which affects imaging quality, especially with high-pixel imaging elements requiring precise alignment.
Innovation Solution
A manufacturing method and device that utilize a measurement chart and adsorption head with a suction hole to hold the lens unit by adsorbing its surface perpendicular to the axis, allowing for precise adjustment and fixing of the imaging element unit relative to the lens unit, using lens driving units to align the optical axis and photo-curable adhesive for secure bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens unit is held by interposing side surfaces between arms, then the lens unit can be held during manufacturing, but the optical axis direction deviates from the desired state
Solution Approach 1:
The patent replaces the mechanical arm-based holding system with a vacuum adsorption system. The adsorption head uses vacuum pressure to hold the lens unit from above, eliminating the need for side-surface interposition and preventing optical axis deviation that occurs with arm-based mechanical holding.
Solution Approach 2:
The patent employs vacuum adsorption through an adsorption head connected to a vacuum source. The vacuum pressure creates a holding force on the lens unit's upper surface, providing stable positioning without mechanical contact from sides, thereby maintaining optical axis accuracy during manufacturing operations.
2Ease of manufacture
If air adsorption is used to hold the lens barrel, then the lens barrel can be easily adsorbed, but it is difficult to adsorb the housing containing the lens barrel
Solution Approach 1:
The patent separates the holding function from the housing structure. Instead of attempting to adsorb the entire housing assembly, the system focuses on adsorbing only the lens unit (or lens barrel) which has a suitable upper surface for vacuum contact. This segmentation allows air adsorption to be applied effectively to the appropriate component regardless of the housing structure.
Solution Approach 2:
The adsorption head serves as an intermediary device that bridges the vacuum source and the lens unit. It provides a dedicated adsorption interface on its upper surface, enabling vacuum holding of the lens unit without requiring modifications to the housing structure or attempting to adsorb the entire assembly.
3Manufacturing precision
If the lens unit and imaging element unit are positioned with high accuracy, then imaging quality improves, but the positioning process becomes more complex
Solution Approach 1:
The patent employs measurement charts and imaging elements that automatically detect and indicate positioning accuracy. The system uses the imaging element itself to capture images of measurement charts, providing feedback on whether the lens unit and imaging element unit are correctly aligned, thereby simplifying the high-precision positioning process through self-detection.
Solution Approach 2:
The positioning system incorporates feedback mechanisms where measurement charts are imaged by the imaging element, and the captured images are analyzed to determine positioning accuracy. This feedback loop allows for real-time adjustment and verification of the relative positions of the lens unit and imaging element unit, simplifying the achievement of high positioning accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate determination of the lens unit position, improving imaging quality by preventing optical axis deviations and allowing for high-precision alignment, even with high-pixel imaging elements, while simplifying the manufacturing process and reducing design costs.
Implementation Method 1
hold the lens unit by sucking air from a suction hole provided on the adsorption surface
Implementation Method 2
photo-curable adhesive for secure bonding
Data Source
AI summary
The present invention provides an imaging module manufacturing method capable of performing positioning of an imaging element unit and a lens unit with high accuracy and provides an imaging module manufacturing device. In a manufacturing device (200), in a state where a top surface (11a) of a housing (11) of a lens unit (10) is adsorbed to an adsorption surface (75d) of an adsorption head (75a) so as to hold the lens unit (10) on a Z axis and an imaging element unit (20) is held on the Z axis, a Z axis direction position of the imaging element unit (20) with respect to the lens unit (10) is changed, a measurement chart (89) is imaged by the imaging element (27), and a position and an inclination of the imaging element unit (20) with respect to the lens unit (10) are adjusted based on imaging signals obtained by the imaging.